$6\left(y^2-9\right)$
$cos2x=-\frac{1}{2}$
$2.4^2$
$15\cdot80+30$
$\:100\cdot\:6n^2x^2-150\cdot\:6n^2x^3+200\cdot\:6n^3x^3$
$\int27x\cdot\cos\left(x\right)dx$
$5x-y=20$
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